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| author | Masami Hiramatsu <mhiramat@kernel.org> | 2017-12-29 11:45:51 +0900 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-01-02 14:27:29 -0500 |
| commit | c3fde1bd28f7c720d7bc587e85e54706df4f8163 (patch) | |
| tree | 88de466d3c6836c14ed99be75d4cc49249540d43 /net/ipv4 | |
| parent | 4e3b95f1983b2d39dd27349d83ffc520aab3516d (diff) | |
| download | linux-c3fde1bd28f7c720d7bc587e85e54706df4f8163.tar.gz linux-c3fde1bd28f7c720d7bc587e85e54706df4f8163.tar.bz2 linux-c3fde1bd28f7c720d7bc587e85e54706df4f8163.zip | |
net: tcp: Add trace events for TCP congestion window tracing
This adds an event to trace TCP stat variables with
slightly intrusive trace-event. This uses ftrace/perf
event log buffer to trace those state, no needs to
prepare own ring-buffer, nor custom user apps.
User can use ftrace to trace this event as below;
# cd /sys/kernel/debug/tracing
# echo 1 > events/tcp/tcp_probe/enable
(run workloads)
# cat trace
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/tcp_input.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 4d55c4b338ee..ff71b18d9682 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -5299,6 +5299,9 @@ void tcp_rcv_established(struct sock *sk, struct sk_buff *skb, unsigned int len = skb->len; struct tcp_sock *tp = tcp_sk(sk); + /* TCP congestion window tracking */ + trace_tcp_probe(sk, skb); + tcp_mstamp_refresh(tp); if (unlikely(!sk->sk_rx_dst)) inet_csk(sk)->icsk_af_ops->sk_rx_dst_set(sk, skb); |